'Ray Peterson' reads a book entitled 'The Theory and Practice of Demonology' by 'Julian Karswell'. In the film 'Night of the Demon', the demonologist character is called 'Julian Karswell'.
Raimi intended this to be a remake but could not secure the rights to the film. Instead, they kept many elements and rewrote the story. Elements kept: 3 day hex, the passing of an item to be rid the curse, the train station used for the ending, etc.